Detailed FAQs to choose best battery for storing solar power



The demand for storing renewable energy is rising day by day. Sun is the best renewable energy source with infinite solar energy. But, we can only make electricity from sunlight during the day. So, we use batteries to store electricity for later use, like at night or on cloudy days. So, let’s learn everything you need to know about batteries and to choose the best battery for storing solar power.

1. What are the benefits of storing solar power?

The major benefits of storing solar power are as follows:

  • The solar system works most efficiently when the sun is up, and the sky is clear. However, it will not be efficient during winter or cloudy days. Stored solar power can guarantee power supply even during less sunlight.
  • The rates per unit of electricity are usually high during peak hours. You can use the stored solar power during peak hours and prevent costly electricity bills.
  • Stored electrical power helps balance out the electrical loads as the demand and production of the load are high or low.
  • Solar power is a renewable and clean energy source. Compared with traditional energy sources, there will be no pollution emissions in the process of using solar power to generate electricity. Using solar power to generate electricity is beneficial to the environment.
  • Storing solar power is a great energy solution and is helpful when living in an area with an unstable grid. Storing solar power can help you solve the problem of power supply all the time.

2. What are the components of solar power systems?

A solar power system is comprised of 5 major components. These components are as follows: 

What are the components of solar power systems


  • Solar plates: The solar plates are the most important part of a solar system. It absorbs sunlight coming from the sun and converts it into electrical energy.
  • Inverters: Solar panels absorb sunlight and convert it into DC. An inverter is a power electronic device that converts DC into AC for consumer use.
  • Racking: The solar panels must be positioned for maximum sunlight. These panels stay in the open for years. So, we use racking to mount the panels on them and fix them at one secure location. There are three types of rackings are roof mounts, pole mounts, and ground mounts.
  • Batteries: They are an important part of a solar system to store electrical energy for later use. The best battery for storing solar power is a lithium-ion battery.
  • Charge controllers: These controllers are used to control the flow of current from panels to batteries.

3. How to store solar power?

Get the number of solar panels according to your daily load. Connect them with each other and fix them using rackings at a place with maximum exposure to sunlight. Make sure to connect the inverter and the charge controllers properly. Connect the solar system to the load and the battery with wires. The sunlight will fall on the solar panels and gets converted into DC electrical energy. The inverter will convert DC into AC and then transfer it to load.

The excess electrical energy will be stored in the battery. Technically, in addition to battery energy storage, solar energy can also be stored through mechanical energy storage or thermal energy storage, such as pumped hydro energy storage or molten salt energy storage technology, but these energy storage solutions require a lot of space, materials, etc. Overall, battery energy storage is the best choice for storing solar power at home.

4. What are the different types of solar batteries? What is the best battery for storing solar power?

Four types of batteries are used for storing electrical energy made from sunlight. These types are as follows:

What are the different types of solar batteries What is the best battery for storing solar power


Lead acid battery: Lead acid battery is the cheapest but low energy density battery for energy storage. The lead Acid battery has two further sub-types: sealed lead acid and flooded lead acid batteries.

● Nickel cadmium battery: This type of battery is one of the most durable of all batteries, especially in the aircraft industry. Compared nicad vs lithium, Nickel-cadmium batteries are not as widely used as lithium-ion batteries because Nickel-cadmium batteries contain harmful heavy metals and have serious memory effects.

Flow battery: A flow battery is one of the modern types of battery in energy storage. This type is special in the sense that you can discharge it completely without damaging it. Due to its long lifespan, you can use this battery for up to 30 years in correct way. The cost of flow batteries is high, and they are not widely used at present.

Lithium-ion battery: The best battery for storing solar power is a lithium-ion battery. These batteries have a long life span of at least 10 years. It requires less space and stores more energy. Plus, it requires no maintenance compared to other batteries. Lithium-ion battery is the best battery for storing solar power for home solar installations such as power wall because of their high energy density and small space.

5. What are the common specifications of solar batteries?

The best batteries for the solar storing system are lithium-ion batteries. Let’s have a look at the specifications of lithium-ion batteries. The following provides information on 24V/100Ah lithium-ion batteries for off-grid systems solutions from 1KW to 20KW.

Size (L*W*H)


Energy density

100 - 150 W·h/L

Charge / Discharge efficiency


Self discharge rate

3.5% per month



Cell nominal voltage

3.2 V

Cycle durability

Up to 4000 cycles

6. How do batteries store solar power?

Solar panels convert solar energy into electrical energy and transmit it to the batteries. As the energy is pumped into the batteries, a chemical reaction takes place inside the battery. It releases lithium ions and electrons into the electrolyte solution, which stores electricity.

7. How to calculate how much Wh of solar battery and solar panel I need?

How to calculate how much Wh solar battery and solar panels I need


First, calculate the overall load of your home or shop using a clamp meter. Get the current and voltages reading and multiply to get the total power load. Let’s assume you get an 1100 W reading on the clamp meter. For 1100 loads, you need at least 4 to 5 solar panels of 250 watts.

Now, calculate the backup time of the battery depending on how long you want the stored energy. Let’s say you want the battery to work for 4 hours. Multiply the 1100W load with 4, and you get 4400 Wh. It means you need a lithium-ion battery of at least 5KWH. If above 3000W, power walls are the best choice.

8. How to choose an inverter for a solar battery system?

When choosing an inverter for a solar cell system, it depends on whether the solar cell of the system can drive the inverter. The kWh of the battery must be greater than or equal to the kWh of the inverter. And pay attention to whether the communication protocol of the solar system and the inverter match.

9. How long can solar power be stored in a battery?

It depends on the type of battery and its lifespan. The best battery for storing solar power is a lithium-ion battery. The main factor affecting how long a standard lithium battery can store solar energy is self-discharge. In theory, solar energy can be stored in batteries for nearly two years.

10. What is the best battery for storing solar power at home?

The lithium-ion battery is the best battery for storing solar power at home. It requires less space, has a longer lifespan, and is more durable than the other batteries. Also, lithium-ion batteries have longer battery life than other batteries.

11. How to choose the best battery for storing solar power for your home?

You need to keep the following features in mind while selecting the best battery for storing solar power.

How to choose the best battery for storing solar power for your home


  • The specifications of the battery must be according to the requirement of your home solar system.
  • Battery capacity should meet the load demands of the home.
  • The lifespan of the battery should be leasted.
  • If the peak power output of the battery is higher, it is better than the lower peak output.
  • The battery’s round trip efficiency should be 90%.

    If the solar power you need above 3KW, you can choose power wall, if below 3KW, choose 24v lithium ion battery pack.


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